This year, a contractor agrees to build a building for $2,500,000 by the end of next year. The builder's cost is estimated to be $1,800,000. The actual costs this year are $900,000 and next year's actual costs are $1,300,000. Under the percentage of completion method this year's gross profit is
a. $0.
b. $300,000.
c. $350,000.
d. $700,000.